code: def login(
      username: str, password: str, registry: str
  ) -> Optional[str]:
      """Login to a registry."""
      return shell(
          [
              "login",
              "--username",
              username,
              "--password",
              password,
              registry,
          ]
      )
  
imports: import json
  import logging
  import os
  import subprocess
  from typing import Any, Dict, List, Optional, Tuple, Union
  import requests
  from dockerpycreds.utils import find_executable
  from wandb.docker import auth, www_authenticate
  from wandb.errors import Error
label_desc: Use image node_id 17 for calling a global function with example usage: login(username, password, registry) and returns: shell